> For the complete documentation index, see [llms.txt](https://docs.layraweb.com.tr/merhaba/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.layraweb.com.tr/merhaba/anadil/calismalar-ve-notlar/if/if-ile-uzunluk-kontrolu.md).

# İf İle Uzunluk Kontrolü

```visual-basic
If (Length(Form.tckimlikno.ValueNum))<11 then
    MessageBox("T.C. Kimlik 11 Haneden Küçük Olamaz", "Model", MB_ICONSTOP)
    Return
  EndIf  
```